1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from six.moves import range
from twisted.internet import defer, reactor
from twisted.internet.defer import CancelledError
from synapse.logging.context import LoggingContext, current_context
from synapse.util import Clock
from synapse.util.async_helpers import Linearizer
from tests import unittest
class LinearizerTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_linearizer(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
with cm1:
self.assertFalse(d2.called)
with (yield d2):
pass
@defer.inlineCallbacks
def test_linearizer_is_queued(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
# Since d1 gets called immediately, "is_queued" should return false.
self.assertFalse(linearizer.is_queued(key))
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
# Now d2 is queued up behind successful completion of cm1
self.assertTrue(linearizer.is_queued(key))
with cm1:
self.assertFalse(d2.called)
# cm1 still not done, so d2 still queued.
self.assertTrue(linearizer.is_queued(key))
# And now d2 is called and nothing is in the queue again
self.assertFalse(linearizer.is_queued(key))
with (yield d2):
self.assertFalse(linearizer.is_queued(key))
self.assertFalse(linearizer.is_queued(key))
def test_lots_of_queued_things(self):
# we have one slow thing, and lots of fast things queued up behind it.
# it should *not* explode the stack.
linearizer = Linearizer()
@defer.inlineCallbacks
def func(i, sleep=False):
with LoggingContext("func(%s)" % i) as lc:
with (yield linearizer.queue("")):
self.assertEqual(current_context(), lc)
if sleep:
yield Clock(reactor).sleep(0)
self.assertEqual(current_context(), lc)
func(0, sleep=True)
for i in range(1, 100):
func(i)
return func(1000)
@defer.inlineCallbacks
def test_multiple_entries(self):
limiter = Linearizer(max_count=3)
key = object()
d1 = limiter.queue(key)
cm1 = yield d1
d2 = limiter.queue(key)
cm2 = yield d2
d3 = limiter.queue(key)
cm3 = yield d3
d4 = limiter.queue(key)
self.assertFalse(d4.called)
d5 = limiter.queue(key)
self.assertFalse(d5.called)
with cm1:
self.assertFalse(d4.called)
self.assertFalse(d5.called)
cm4 = yield d4
self.assertFalse(d5.called)
with cm3:
self.assertFalse(d5.called)
cm5 = yield d5
with cm2:
pass
with cm4:
pass
with cm5:
pass
d6 = limiter.queue(key)
with (yield d6):
pass
@defer.inlineCallbacks
def test_cancellation(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
d3 = linearizer.queue(key)
self.assertFalse(d3.called)
d2.cancel()
with cm1:
pass
self.assertTrue(d2.called)
try:
yield d2
self.fail("Expected d2 to raise CancelledError")
except CancelledError:
pass
with (yield d3):
pass
|
